diff -r d48b80d58848 -r 7824783a6d5e mercurial/templater.py
--- a/mercurial/templater.py	Wed Apr 04 21:06:14 2018 +0900
+++ b/mercurial/templater.py	Tue Mar 20 23:56:26 2018 +0900
@@ -32,6 +32,9 @@
 True, False, int, float
     can be stringified as such.
 
+wrappedbytes, wrappedvalue
+    a wrapper for the above printable types.
+
 date tuple
     a (unixtime, offset) tuple, which produces no meaningful output by itself.